Flexible touch screen display

Abstract

A touch sensitive active matrix display device is provided. The device includes a display fabricated on a first flexible substrate, said display having a viewing surface. The device further includes a touch sensitive sensor including a second flexible substrate, under said display. The touch sensor is operated by touching said viewing surface of said display, and said combined display and touch sensitive sensor is flexible.

What is claimed is: 
     
       1. A touch sensitive active matrix display device, the device comprising:
 a display having a viewing surface; and 
 a capacitive touch sensitive sensor integrated with and under said display, said touch sensitive sensor comprising a flexible substrate, and at least one conductive layer on said flexible substrate; and 
 wherein said capacitive touch sensitive sensor is operable by touching said viewing surface of said display; 
 wherein said display comprises an electronic paper display medium and has a backplane comprising an active matrix, said active matrix having an array of field-effect transistors comprising an organic semiconductor, said transistors configured to control said display; 
 wherein said backplane is disposed on said at least one conductive layer with a dielectric isolation layer between said at least one conductive layer and electroactive layers of said backplane, with said dielectric isolation layer providing electrical insulation between said at least one conductive layer and said electroactive layers of said backplane; and 
 wherein said display and capacitive touch sensitive sensor in combination have a flexibility greater than needed for functionality of operation of said capacitive touch sensitive sensor such that said display and capacitive touch sensitive sensor in combination is bendable as a whole. 
 
     
     
       2. A touch sensitive display device as claimed in  claim 1  wherein said capacitive touch sensitive sensor includes a layer comprising a substantially non-transparent conductor. 
     
     
       3. A touch sensitive display device as claimed in  claim 1  wherein said display includes a backplane comprising an array of thin-film transistors, and wherein said backplane is located substantially on a neutral surface of said device. 
     
     
       4. A touch sensitive display device as claimed in  claim 1  wherein said display comprises a pixellated display. 
     
     
       5. A touch sensitive display device as claimed in  claim 1  wherein said display includes a multilayer electronic structure adapted to solution deposition. 
     
     
       6. A touch sensitive display device as claimed in  claim 5  wherein said multilayer electronic structure comprises said active matrix backplane of said display. 
     
     
       7. A touch sensitive active matrix display device as claimed in  claim 1 , wherein said organic semiconductor is a solution-processed polymer semiconductor. 
     
     
       8. A touch sensitive active matrix display device as claimed in  claim 1 , wherein said field-effect transistor comprises an organic gate dielectric. 
     
     
       9. A touch sensitive active matrix display device as claimed in  claim 8 , wherein said organic gate dielectric is a solution-processed polymer dielectric. 
     
     
       10. A touch sensitive active matrix display device as claimed in  claim 8 , wherein said organic gate dielectric is deposited by chemical vapour deposition. 
     
     
       11. A touch sensitive active matrix display device as claimed in  claim 10 , where said organic gate dielectric is parylene. 
     
     
       12. A touch sensitive active matrix display device as claimed in  claim 8 , wherein said organic gate dielectric has a thickness between 200 nm and 1 □m. 
     
     
       13. A touch sensitive display device as claimed in  claim 1  wherein said flexible substrate has a thickness in the range of 10 μm to 250 μm. 
     
     
       14. A touch sensitive display device as claimed in  claim 1  wherein said flexible substrate has a thickness in the range 20 μm to 200 μm. 
     
     
       15. A touch sensitive display device as claimed in  claim 1  wherein said dielectric isolation layer has a thickness of 1 μm to 20 μm. 
     
     
       16. A touch sensitive display device as claimed in  claim 1  wherein said dielectric isolation layer is arranged to provide planarization of the viewing surface of said display. 
     
     
       17. A touch sensitive display device as claimed in  claim 1  wherein said backplane is laminated onto said at least one conductive layer with only said dielectric isolation layer between said at least one conductive layer and said electroactive layers of said backplane.